The Azure equivalent to Amazon S3 (Simple Storage Service) is Azure Blob Storage. Azure Blob Storage is a cloud-based object storage service provided by Microsoft Azure that allows you to store and manage unstructured data, including documents, images, videos, and other types of files. It is highly scalable, durable, and designed to handle a wide range of data storage and management scenarios.

Key features of Azure Blob Storage, which make it equivalent to Amazon S3, include:

1. Object Storage: Azure Blob Storage is designed for storing objects or files. Each object is identified by a unique URL, making it easy to access and manage individual files.

2. Scalability: Azure Blob Storage is highly scalable, and you can store an almost unlimited amount of data. You can easily scale up or down based on your storage needs.

3. Durability: Data stored in Azure Blob Storage is highly durable, with redundant copies of your data stored across multiple data centers to ensure data availability.

4. Data Tiers: Azure Blob Storage offers different data tiers, including Hot, Cool, and Archive, which allow you to optimize storage costs based on the access patterns of your data.

5. Security: Azure Blob Storage provides robust security features, including data encryption in transit and at rest, role-based access control (RBAC), and shared access signatures (SAS) for fine-grained access control.

6. Data Analytics: You can use Azure services like Azure Data Lake Storage, Azure Databricks, and Azure HDInsight for advanced data analytics and processing with data stored in Azure Blob Storage.

7. Integration: Azure Blob Storage integrates seamlessly with other Azure services, such as Azure Data Factory, Azure Functions, and Azure Logic Apps, enabling you to build comprehensive data solutions.

8. Versioning: Azure Blob Storage supports versioning, allowing you to keep track of changes to objects over time.

9. Lifecycle Management: You can define rules and policies for automatic data lifecycle management, including data retention and deletion based on specified criteria.

10. Geo-Replication: Azure Blob Storage offers geo-replication options, allowing you to replicate data to different Azure regions for data redundancy and disaster recovery.